Cooling device for hydraulic braking systems

ABSTRACT

A cooling device for hydraulic braking systems includes a case, a turbine unit, and a ring which is connected to an end of a hub. The case has a thorough hole and a ventilation exit communicating inside and outside of the case is defined on the case. The turbine unit is located in the case and has a fixing hole which communicates with the through hole. The ring is connected to the fixing hole of the turbine unit. The ring drives the turbine unit which generates air flows in the case. The air flows flow to the outside of the case via the ventilation exit to remove the heat of the braking system.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to cooling device for hydraulic brakingsystems, and more particularly to a cooling action to the hydraulicbraking system by air ventilation.

2. Description of Related Art

Bicycles are very popular today. When a cyclist rides a bicycle along anuphill, the braking system ensures the safety for the cyclist and themodern braking system is operated by hydraulic system which drives thelining plates in the braking system to contact the braking disc to slowdown and stop the wheel. For the reason of safety, it is necessary tobrake frequently when the cyclist rides along a downhill. Consequently,the braking disc can be overheat and further reduce the frictioncoefficient between the lining plates and the braking disc, such thatthe cyclist might be dangerous when the braking system is not work.

Some manufacturers set recesses defined in the braking disc to allow airto flow through the recesses along the tangent direction to remove theheat when the braking disc rotates. However, the braking disc is ahollow plate which cannot generate air ventilation by the rotation ofitself, thus the temperature cannot be reduced efficiently. When thetemperature of the braking disc continuously increases, the brakingfunction is not sensitive and the braking disc may be deformedpermanently. The deformation may cause cracks to the braking disc sothat it is important to reduce the high temperature of the braking discto ensure the safety of the riders.

The present invention has arisen to mitigate and/or obviate thedisadvantages of the conventional braking systems and provides a coolingdevice for hydraulic braking systems to cool down the braking disc.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a coolingdevice for improving overheat of the conventional braking systems.

To achieve the objective, a cooling device for hydraulic braking systemscomprises a case having a thorough hole defined therethrough and aventilation exit defined on the case, the ventilation exit communicatinginside and outside of the case, a turbine unit located in the case andhaving a fixing hole, the fixing hole communicated with the through holeand having a plurality of protrusions at an inside of the fixing hole, aring connected to an end of a hub and connected to the fixing hole ofthe turbine unit, the ring having a plurality of notches to engage withthe protrusions; wherein the ring drives the turbine unit whichgenerates air flows in the case, the air flows flowing to the outside ofthe case via the ventilation exit to remove the heat.

A guide groove is defined in a side of the turbine unit and a pluralityof ribs are located around the guide groove, the ribs extendedinclinedly along a curvature and toward the fixing hole, an aperturedefined between any of the adjacent ribs and located on a periphery ofthe guide groove.

A diameter of the turbine unit is larger than a diameter of the throughhole.

The turbine unit has a plurality of clamping plates located around thefixing hole and the clamping plates are arranged in pairs and located ontwo sides of the portions between two notches for clamping.

Further benefits and advantages of the present invention will becomeapparent after a careful reading of the detailed description withappropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view to show the first embodiment of the presentinvention;

FIG. 2 is a perspective view to show the first embodiment of the presentinvention;

FIG. 3 is a cross-sectional view of a turbine unit of the firstembodiment of the present invention;

FIG. 4 is an assembled view to show the operation status of the firstembodiment of the present invention; and

FIG. 5 is a perspective view to show the second embodiment of thepresent invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings and initially to FIGS. 1 to 3, the coolingdevice for hydraulic braking systems in accordance with the presentinvention comprises a case 1, a turbine unit 2 and a ring 4 that isconnected to an end of a hub 3. The case 1 is a spiral case and athorough hole 11 is defined therethrough. A ventilation exit 12 isdefined on the case 1 and communicates the inside and the outside of thecase 1, so that the air convection between the inside and the outside ofthe case 1 is possible. The turbine unit 2 is located and operated inthe case 1 and the turbine unit 2 has a fixing hole 21 whichcommunicates with the through hole 11. A plurality of protrusions 22 islocated at an inside of the fixing hole 21 and each protrusion 22 is anoval protrusion. The conjunction portions between the two sides of theprotrusion 22 and the fixing hole 21 are two recesses so as to bepivotably connected with the ring 4. A guide groove 23 is defined in aside of the turbine unit 2 which has an open end and a closed end toreinforce the air flows. A plurality of ribs 24 is located around theguide groove 23 and the ribs 24 extend inclinedly along a curvature andcounterclockwise toward the fixing hole 21. An aperture 25 is definedbetween any of the two adjacent ribs 24 and located on the periphery ofthe guide groove 23. The aperture 25 is an elongate hole which iscooperated with the ribs 24 to generate air flows. The diameter of theturbine unit 2 is larger than the diameter of the through hole 11. Bythe arrangement, when the turbine unit 2 operates in the case 1, theturbine unit 2 does not drop off form the case 1. The ring 4 isconnected to the fixing hole 21 of the turbine unit 2 and a plurality ofnotches 41 is defined in the outer periphery of the ring 4. Theprotrusions 22 are engaged with the notches 41. The ring 4 drives theturbine unit 2 which generates air flows in the case 1. The air flowsflow to the outside of the case 1 via the ventilation exit 12 to removeheat.

Referring to FIG. 4, the operation status comprises a hydraulic clamper5 and a braking disc 6. The air flows are guided to the hydraulicclamper 5 and the braking disc 6 via the ventilation exit 12 to cool thebraking disc 6.

Referring to FIG. 5, in the second embodiment of the present invention,wherein the turbine unit 2 has a plurality of clamping plates 26 locatedaround the fixing hole 21 and the clamping plates 26 are arranged inpairs and corresponding to two sides of the portions between two notches41 for clamping. The ring 4 is fixed to the turbine unit 2 so that whenthe hub 3 is operated, the ring 4 is co-rotated and drives the turbineunit 2 which generates air flows in the case 1. The air flows are guidedto outside of the case 1 via the ventilation exit 12 to achieve thepurpose of cooling.

Although the invention has been explained in relation to its preferredembodiment, it is to be understood that many other possiblemodifications and variations can be made without departing from thespirit and scope of the invention as hereinafter claimed.

1. A cooling device for hydraulic braking systems comprising: a casehaving a thorough hole defined therethrough and a ventilation exitdefined on the case, the ventilation exit communicating inside andoutside of the case; a turbine unit located in the case and having afixing hole, the fixing hole communicated with the through hole andhaving a plurality of protrusions at an inside of the fixing hole; and aring connected to an end of a hub and connected to the fixing hole ofthe turbine unit, the ring having a plurality of notches to engage withthe protrusions; wherein the ring drives the turbine unit whichgenerates air flows in the case, the air flows flowing to the outside ofthe case via the ventilation exit to remove the heat.
 2. The coolingdevice for hydraulic braking systems as claimed in claim 1, wherein aguide groove is defined in a side of the turbine unit and a plurality ofribs are located around the guide groove, the ribs extended inclinedlyalong a curvature and toward the fixing hole, an aperture definedbetween any of the adjacent ribs and located on a periphery of the guidegroove.
 3. The cooling device for hydraulic braking systems as claimedin claim 1, wherein a diameter of the turbine unit is larger than adiameter of the through hole.
 4. The cooling device as claimed in claim1, wherein the turbine unit has a plurality of clamping plates locatedaround the fixing hole and the clamping plates are arranged in pairs andlocated on two sides of the portions between two notches for clamping.